Nd0.7Sr0.3MnO3陶瓷EPIR效应的起源

杨昌平; 陈顺生; 戴琪; 宋学平

doi:10.7498/aps.60.117202

摘要

用两线法和四线法对球磨合成后热处理的Nd0.7Sr0.3MnO3陶瓷样品的电脉冲诱导电阻转变(EPIR)效应进行了测试.结果表明:在Nd0.7Sr0.3MnO3块体中用四线法测得的I-V曲线为非线性,说明Nd0.7Sr0.3MnO3样品在晶(相)界处存在空间电荷层和界面电阻.但用四线法测量EPIR效应时,没有EPIR效应发生,表明晶(相)界处的空间电荷层和肖特基势垒不能产生EPIR效应;对同一样品采用直流两线法测量,其I-V曲线也为非线性,但却发生明显的EPIR效应.说明在Nd0.7Sr0.3MnO3陶瓷中发现的EPIR效应起源于样品与电极之间的接触界面,块体内的晶(相)界处虽能产生相似I-V特性,但却不能发生EPIR效应.

关键词:

Abstract

Polycrystalline ceramic Nd0.7Sr0.3MnO3 is synthesized using high-energy ball milling and post heat treatment method. The properties of electric transport are measured using direct current (DC) 4-wire and 2-wire methods. The results show that both the grain (phase) boundary and the electrode-bulk contact interface has interfacial resistance and space charge layer. The two kinds of space charge regions have greatly different effects on the DC transport: for the former, the I-V curve exhibits nonlinear characteristic and no EPIR effect takes place; for the later, however, an obvious EPIR effect is observed even if the I-V curve also shows nonlinear behaviour. It well suggests that for the ceramic Nd0.7Sr0.3MnO3, only the electrode-bulk contact interface can induce the EPIR effect although there is a similar nonlinear I-V characteristic for the grain (phase) boundary and the electrode-bulk contact interface.

Keywords:

作者及机构信息

1.
湖北大学物理学与电子技术学院,铁电压电材料与器件湖北省重点实验室,武汉 430062;

2.
燕山大学材料科学与工程学院,亚稳材料制备技术与科学国家重点实验室,秦皇岛 066004

基金项目: 国家自然科学基金(批准号:11174073,11074067)和教育部新世纪优秀人才支持计划(批准号:NCET-08-0674)资助的课题.

Authors and contacts

1.
Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062, China;

2.
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China

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施引文献

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